angular/packages/compiler/test/i18n/message_bundle_spec.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */

import {serializeNodes} from '../../src/i18n/digest';
import * as i18n from '../../src/i18n/i18n_ast';
import {MessageBundle} from '../../src/i18n/message_bundle';
import {Serializer} from '../../src/i18n/serializers/serializer';
import {HtmlParser} from '../../src/ml_parser/html_parser';

describe('MessageBundle', () => {
  describe('Messages', () => {
    let messages: MessageBundle;

    beforeEach(() => {
      messages = new MessageBundle(new HtmlParser(), [], {});
    });

    it('should extract the message to the catalog', () => {
      messages.updateFromTemplate('<p i18n="m|d">Translate Me</p>', 'url');
      expect(humanizeMessages(messages)).toEqual(['Translate Me (m|d)']);
    });

    it('should extract and dedup messages', () => {
      messages.updateFromTemplate(
        '<p i18n="m|d@@1">Translate Me</p><p i18n="@@2">Translate Me</p><p i18n="@@2">Translate Me</p>',
        'url',
      );
      expect(humanizeMessages(messages)).toEqual(['Translate Me (m|d)', 'Translate Me (|)']);
    });
  });
});

class _TestSerializer extends Serializer {
  override write(messages: i18n.Message[]): string {
    return messages
      .map((msg) => `${serializeNodes(msg.nodes)} (${msg.meaning}|${msg.description})`)
      .join('//');
  }

  override load(
    content: string,
    url: string,
  ): {locale: string | null; i18nNodesByMsgId: {[id: string]: i18n.Node[]}} {
    return {locale: null, i18nNodesByMsgId: {}};
  }

  override digest(msg: i18n.Message): string {
    return msg.id || `default`;
  }
}

function humanizeMessages(catalog: MessageBundle): string[] {
  return catalog.write(new _TestSerializer()).split('//');
}